Light source apparatus

ABSTRACT

A light source apparatus including a light-emitting module and a control unit is provided. The light-emitting module is configured to provide a light. The control unit makes the light emitted from the light-emitting module switched among a plurality of kinds of first light. Correlated color temperatures of the plurality of kinds of first light are different from each other, and circadian action factors of the plurality of kinds of first light are substantially the same as each other.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation-in-part application of and claims thepriority benefit of a prior application Ser. No. 14/746,857, filed onJun. 23, 2015, now allowed. The application Ser. No. 14/746,857 is acontinuation-in-part application of and claims the priority benefit ofanother prior application Ser. No. 13/864,235, filed on Apr. 16, 2013,U.S. Pat. No. 9,095,029. The application Ser. No. 13/864,235 claims thepriority benefit of Taiwan application serial no. 101151048, filed onDec. 28, 2012. The entirety of each of the above-mentioned patentapplications is hereby incorporated by reference herein and made a partof this specification.

TECHNICAL FIELD

The disclosure is generally related to a light source apparatus, andspecially related to a light source apparatus able to provide differentcircadian stimulus lights.

BACKGROUND

Along with Thomas Alva Edison invented the light bulb, the light sourceproduced by the electric power lights up the night, and also thecivilization of mankind. With this kind of artificial light source, thehuman is able to take advantage of the time at night, which thus furtherled to the development of science, technology and education. In theresearch field about the impact of a light source on circadian stimulus(CS), Yasukouchi discovered the light source with high color temperatureat night can more inhibit the secretion of melatonin than a light sourcewith low color temperature. Next, since 2001, Branard has studied therelationship between the human eyes and the biological effects, so as tofurther reveal the relationship between the light source and thesecretion of melatonin and the biological influences, which can beexpressed by FIG. 1 “The relationship curve between a light source andthe corresponding circadian stimulus” (2001, Action Spectrum forMelatonin Regulation in Humans: Evidence for a Novel CircadianPhotoreceptor). The further studies point out different wavelengths (400nm-550 nm) of a light source have different influences on CS. Therefore,by judging the influence extent of a light source on human CS, a lightsource used for night or daytime should be different ones respectivelywith different appropriate spectral composition so as to provideappropriate artificial lighting sources.

SUMMARY

An embodiment of the disclosure provides a light source apparatusincluding a light-emitting module and a control unit. The light-emittingmodule is configured to provide a light. The control unit makes thelight emitted from the light-emitting module switched between a firstlight and a second light. A spectrum of the first light is differentfrom a spectrum of the second light, and color temperatures of the firstlight and the second light are substantially the same as each other.

An embodiment of the disclosure provides a light source apparatusincluding a light-emitting module and a control unit. The light-emittingmodule is configured to provide a light. The control unit makes thelight emitted from the light-emitting module switched among a pluralityof kinds of first light. Correlated color temperatures of the pluralityof kinds of first light are different from each other, and circadianaction factors of the plurality of kinds of first light aresubstantially the same as each other.

Several exemplary embodiments accompanied with figures are described indetail below to further describe the disclosure in details.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the disclosure, and are incorporated in and constitutea part of this specification. The drawings illustrate embodiments of thedisclosure and, together with the description, serve to explain theprinciples of the disclosure.

FIG. 1 is a diagram illustrating the relationship curve between a lightsource and the corresponding CS/P.

FIG. 2A is a schematic diagram of a light source apparatus in anembodiment of the disclosure.

FIG. 2B is a diagram of the variation of the light source apparatus inthe embodiment of FIG. 2A.

FIG. 2C is a spectrum diagram showing the relative light intensity andthe optical wavelength according to the light emitted from the lightsource apparatus in the embodiment of FIG. 2B.

FIG. 2D is a timing diagram showing different illumination modes indifferent periods for the light source apparatus in the embodiment ofFIG. 2B.

FIG. 2E is a block chart of the light source apparatus of FIG. 2A.

FIG. 3 is a diagram showing color space coordination patterns of samecolor temperatures defined by American National Standard Institute(ANSI).

FIG. 4A is a schematic diagram of a light source apparatus in anotherembodiment of the disclosure.

FIG. 4B is a diagram showing spectrum curve of the first light in theembodiment of FIG. 4A.

FIG. 4C is a diagram showing spectrum curve of the second light in theembodiment of FIG. 4A.

FIG. 4D is a timing diagram showing different illumination modes indifferent periods for the light source apparatus in the embodiment ofFIG. 4A.

FIG. 5A is a schematic diagram of a light source apparatus in yetanother embodiment of the disclosure.

FIG. 5B is a diagram showing spectrum curve of the first light in theembodiment of FIG. 5A.

FIG. 5C is a diagram showing spectrum curve of the second light in theembodiment of FIG. 5A.

FIG. 5D is a timing diagram showing different illumination modes indifferent periods for the light source apparatus in the embodiment ofFIG. 5A.

FIG. 6A is a schematic diagram of a light source apparatus in yetanother embodiment of the disclosure.

FIGS. 6B-6I are diagrams showing spectrum curves of the lights providedby the light source apparatus 500 under various color temperatureconditions.

FIG. 6J is a timing diagram showing different illumination modes indifferent periods for the light source apparatus in the embodiment ofFIG. 6A.

FIG. 7 is a schematic diagram of a light source apparatus in anotherembodiment of the disclosure.

FIG. 8A is spectra of the first light and the lights respectivelyemitted from the light-emitting units in the first illumination mode inFIG. 7.

FIG. 8B is spectra of the second light and the lights respectivelyemitted from the light-emitting units in the second illumination mode inFIG. 7.

FIG. 9 is the color coordinates of the first light and the second lightin FIG. 7 in the CIE 1976 u′-v′ diagram.

FIG. 10 is a schematic diagram of a light source apparatus in anotherembodiment of the disclosure.

FIG. 11A is spectra of the first light and the lights respectivelyemitted from the light-emitting units in the first illumination mode inFIG. 10.

FIG. 11B is spectra of the second light and the lights respectivelyemitted from the light-emitting units in the second illumination mode inFIG. 10.

FIG. 12 is the color coordinates of the first light and the second lightin FIG. 10 in the CIE 1976 u′-v′ diagram.

FIG. 13A is spectra of the first light and the lights respectivelyemitted from the light-emitting units in the first illumination mode inFIG. 10 according to another embodiment of the disclosure.

FIG. 13B is spectra of the second light and the lights respectivelyemitted from the light-emitting units in the second illumination mode inFIG. 10 according to another embodiment of the disclosure.

FIG. 14 is the color coordinates of the first light and the second lightin FIG. 10 in the CIE 1976 u′-v′ diagram according to another embodimentof the disclosure.

FIG. 15 is a schematic diagram of a light source apparatus in anotherembodiment of the disclosure.

FIG. 16A is spectra of sub-lights emitted by light-emitters in FIG. 15.

FIG. 16B is a graph of the circadian action factor vs. correlated colortemperature of light emitted from the light-emitting module in FIG. 15.

FIG. 16C is a graph of the color rendering index vs. correlated colortemperature of light emitted from the light-emitting module in FIG. 15.

FIG. 16D is a graph of the circadian action factor vs. correlated colortemperature of sunlight.

FIG. 17 is a schematic diagram of a light source apparatus in anotherembodiment of the disclosure.

FIG. 18A is spectra of sub-lights emitted by light-emitters in FIG. 17.

FIG. 18B is a graph of the circadian action factor vs. correlated colortemperature of light emitted from the light-emitting module in FIG. 17.

FIG. 18C is a graph of the color rendering index vs. correlated colortemperature of light emitted from the light-emitting module in FIG. 17.

FIGS. 19A to 19D are graphs of the circadian action factor vs.correlated color temperature of light emitted from the light-emittingmodule in FIG. 17 respectively when the CRIs thereof are greater than80, 90, 93, and 95.

FIG. 20 is a schematic diagram of a light source apparatus in anotherembodiment of the disclosure.

FIG. 21A is spectra of sub-lights emitted by light-emitters in FIG. 20.

FIG. 21B is a graph of the circadian action factor vs. correlated colortemperature of light emitted from the light-emitting module in FIG. 20.

FIG. 21C is a graph of the color rendering index vs. correlated colortemperature of light emitted from the light-emitting module in FIG. 20.

FIGS. 22A and 22B are graphs of the circadian action factor vs.correlated color temperature of light emitted from the light-emittingmodule in FIG. 20 respectively when the CRIs thereof are greater than 80and 90.

DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS

FIG. 2A is a schematic diagram of a light source apparatus in anembodiment of the disclosure, FIG. 2B is a diagram of the variation ofthe light source apparatus in the embodiment of FIG. 2A and FIG. 2C is aspectrum diagram showing the relative light intensity and the opticalwavelength according to the light source apparatus in the embodiment ofFIG. 2B. Referring to FIGS. 2A-2C, in the embodiment, a light sourceapparatus 100 includes a light-emitting module 110 and a control unit120. The light-emitting module 110 provides a light B, and in theembodiment, the light B means the light emitted from the light-emittingmodule 110, which may have a divergence angle and is not limited to aspecific transmitting direction. The control unit 120 is for switchingthe light B emitted from the light-emitting module 110 between a firstlight L1 and a second light L2, in which the CS/P value in view ofphotometry of the second light L2 is less than the CS/P value of thefirst light L1, and the color temperatures of the first light L1 and thesecond light L2 are substantially the same as each other. Thus, thelight source apparatus 100 can provide the first light L1 with high CS/Pvalue or the second light L2 with low CS/P value by selection accordingto the real application environment, time and goal without making theuser easily noticed of the change of the optical color temperature so asto maintain the natural circadian rhythm of user and meanwhile toprovide enough light source.

In more details, in the embodiment, the definition of CS/P value isexpressed by the following formula:

CS = ∫_(vis)CS(λ) ⋅ P_(0λ) ⋅ d λP = ∫_(vis)P(λ) ⋅ P_(0λ) ⋅ d λ${{CS}/P} = \frac{\int_{vis}{{{{CS}(\lambda)} \cdot P_{0\lambda} \cdot d}\; \lambda}}{\int_{vis}{{{P(\lambda)} \cdot P_{0\lambda} \cdot d}\; \lambda}}$

wherein CS(λ) represents human circadian function, P(λ) represents humanphotopic function, P_(0λ) represents spectrum after completing lightblending, CS represents CS/P value of the spectrum after completinglight-blending, and P represents light intensity of the spectrum aftercompleting light-blending, in which P(λ) is defined according toCommission International de l'éclairage (CIE); human circadian functionCS(λ) can refer to the “action spectrum (1997)” introduced by ProfBrainard as shown by FIG. 1, “human invisible circadian function (2005)”introduced by Mark Rea and the circadian function stated in Germanpre-standard, DIN V. The light source apparatus 100 of the disclosurecan be suitable for various circadian functions. FIG. 3 is a diagramshowing color space coordination patterns of same color temperaturesdefined by American National Standard Institute (ANSI). Referring toFIG. 3, in the embodiment, “same color temperatures” is definedaccording to ANSI. In other words, for any light source with the samecolor temperature designed following the ANSI standard, the colordifference of the light source is uneasily noticed by human eyes. Thedetail coordinates corresponding to the color space coordinationpatterns in FIG. 3 defined by ANSI are listed in the following table 1:

TABLE 1 X Y X Y X Y X Y 2700K 3000K 3500K 4000K Center point 0.45780.4101 0.4338 0.4030 0.4073 0.3917 0.3818 0.3797 Tolerance 0.4813 0.43190.4562 0.4260 0.4299 0.4165 0.4006 0.4044 quadrilateral 0.4562 0.42600.4299 0.4165 0.3996 0.4015 0.3736 0.3874 0.4373 0.3893 0.4147 0.38140.3889 0.3690 0.3670 0.3578 0.4593 0.3944 0.4373 0.3893 0.4147 0.38140.3898 0.3716 4500K 5000K 5700K 6500K Center point 0.3611 0.3658 0.34470.3553 0.3287 0.3417 0.3123 0.3282 Tolerance 0.3736 0.3874 0.3551 0.37600.3376 0.3616 0.3205 0.3481 quadrilateral 0.3548 0.3736 0.3376 0.36160.3207 0.3462 0.3028 0.3304 0.3512 0.3465 0.3366 0.3369 0.3222 0.32430.3068 0.3113 0.3670 0.3578 0.3515 0.3487 0.3366 0.3369 0.3221 0.3261wherein the data ranges in Tab 1 can be corresponding to the colortemperature ranges S1-S8 of tolerance quadrilateral in FIG. 3 bycalculation. For example, the CS/P values within the color temperaturerange S1 of tolerance quadrilateral in FIG. 3 are very close to thehuman eyes, and analogy to the rest. In more details, the tolerancequadrilateral in Tab 1 can be calculated to be a color temperaturerange, as shown by Tab 2:

TABLE 2 Nominal correlated color temperature Target-related colortemperature (CCT) (K) and tolerance 2700K 2725 ± 145 3000K 3045 ± 1753500K 3465 ± 245 4000K 3985 ± 275 4500K 4503 ± 243 5000k 5028 ± 2835700K 5665 ± 355 6500K 6530 ± 510wherein the data ranges in Tab 2 can be calculated to be ellipse colortemperature ranges e1-e8 in FIG. 3. In more details, these ellipse colortemperature ranges e1-e8 are David MacAdam ellipses. For example, thecolor temperature coordinates within the ellipse color temperature rangee1 are very close to the human eyes, and analogy to the rest. It shouldbe noted that the coordinate data in Tab 1 and Tab 2 are example toindicate that the color temperatures in the embodiment are substantiallythe same only. The real coordinate data should refer to the up-to-datedefinition of ANSI, which the disclosure is not limited to. In anotherembodiment, “the color temperatures are the substantially same” meansthe color temperatures are within a same ellipse color temperaturerange. In this way, the light source apparatus 100 can select a lightsource with different CS/P value according to the real applicationenvironment, the time and the goal without making the user easilynoticed of the change of the optical color temperature, so as tomaintain the user's circadian rhythm and meanwhile to provide enoughlight source.

In more details, referring to FIG. 2A, the control unit 120 can make thelight-emitting module 110 switched between a plurality of light-emittingmodes, and these light-emitting modes include a first circadian stimulusmode and a second circadian stimulus mode. The light-emitting module 110includes a plurality of light-emitting units D, and these light-emittingunits D can include electroluminescent light-emitting element,light-induced light-emitting element or a combination thereof. Thelight-emitting units D include at least one first light-emitting unitD1, at least one second light-emitting unit D2 and at least one thirdlight-emitting unit D3. The first light-emitting unit D1 provides afirst sub-light beam W1, the second light-emitting unit D2 provides asecond sub-light beam W2, and the third light-emitting unit D3 providesa third sub-light beam W3, in which at least one range of wave peaks ofthe first sub-light beam W1 can be greater than 420 nm but less than 480nm, at least one range of wave peaks of the second sub-light beam W2 canbe greater than 480 nm but less than 540 nm, and at least one range ofwave peaks of the third sub-light beam W3 can be greater than 540 nm.

When the control unit 120 makes the light-emitting module 110 switchedto the first circadian stimulus mode, the control unit 120 makes thefirst portion P1 of the light-emitting units D provide the first lightL1, in which the first light L1 includes the first sub-light beam W1 andthe second sub-light beam W2; when the control unit 120 makes thelight-emitting module 110 switched to the second circadian stimulusmode, the control unit 120 makes the second portion P2 of thelight-emitting units D provide the second light L2, in which the secondlight L2 includes the first sub-light beam W1 and the third sub-lightbeam W3. The color temperatures of the first light L1 and the secondlight L2 are substantially the same, so that the CS/P value can bechanged to meet different requirements without affecting the colortemperature feeling of the user.

In addition, the light source apparatus 100′ in FIG. 2B is similar tothe light source apparatus 100 in FIG. 2A, and in FIG. 2B, each thelight-emitting unit provides a range of wave peaks same as thecorresponding range of wave peaks in the embodiment of FIG. 2A. Thedifference of FIG. 2B from FIG. 2A rests in that the first portion P1′of the light source apparatus 100′ in FIG. 2B further includes a thirdlight-emitting unit D3.

Under the first circadian stimulus mode, the first light provided by thefirst portion P1′ can include the first sub-light beam W1, the secondsub-light beam W2 and the third sub-light beam W3; under the secondcircadian stimulus mode, the second light L2′ provided by the secondportion P2′ can include the first sub-light beam W1 and the thirdsub-light beam W3.

The frequency spectrum of the case of FIG. 2B after finishing thelight-blending is shown by FIG. 2C. Since the CS/P value of the secondsub-light beam W2 is greater than the CS/P value of the third sub-lightbeam W3, the CS/P values of the first light L1′ and the second lightL2′, due to the different light-blending spectrums thereof, aredifferent from each other regardless the first light L1′ and the secondlight L2′ have the same color temperature 3000K. The spectrum of thefirst light L1′ is shown by the light-blending spectrum curve SH1 inFIG. 2C and the CS/P value is roughly 0.43 by calculation; thelight-blending spectrum of the second light L2′ is shown by the spectrumcurve SL1 in FIG. 2C and the CS/P value is roughly 0.27 by calculation,which mean the CS/P value of the first light L1′ by calculation isroughly 159% of the CS/P value of the second light L2′. In this way, theCS/P values of the second light L2′ and the first light L1′ aredifferent from each other more noticed, but the disclosure does notlimit the above-mentioned difference to achieve the above-mentionedgoal.

Moreover, the control unit 120 makes the light B emitted from thelight-emitting module 110′ in a plurality of periods of a whole dayswitched to the first circadian stimulus mode (for providing the firstlight L1′) or the second circadian stimulus mode (for providing thesecond light L2′) according to the requirement. In more details, FIG. 2Dis a timing diagram showing different illumination modes in differentperiods for the light source apparatus in the embodiment of FIG. 2B.Referring to FIGS. 2B and 2D, taking an example, the light sourceapparatus 100′ can be used for illumination of hotel, where the firstlight L1′ with color temperature of 3000K and a higher CS/P value isprovided in the working period (as shown in 9:00-18:00 by FIG. 2D) so asto boost the alertness and working vitality of the service personnel andmeanwhile bring guests visual warmth and comfort feeling; thelight-emitting module 110′ in the light source apparatus 100′ isswitched to provide the second light L2′ with the same color temperatureof 3000K and a lower CS/P value in the evening period (as shown in18:00-22:00 of FIG. 2D) so as to reduce the circadian stimulus on theservice personnel on evening duty and the quests without affecting theillumination color temperature so as to avoid affecting the melatoninsecretion to affect the health of the service personnel and the guests.It should be noted that the timing of FIG. 2D is an example to describethe embodiment only, the disclosure is not limited thereto, and in otherembodiments, the timing can be varied according to the implementationrequirement.

FIG. 2E is a block chart of the light source apparatus of FIG. 2A.Referring to FIG. 2E, in the embodiment, the light source apparatus 100further includes a user interface 130, and the control unit 120 candecide the present illumination modes of the light source apparatus 100according to a signal input from the user interface 130 corresponding tothe operation of the user UR. In more details, the control unit 120 is,for example, a microprocessor, and can make the light-emitting module110 in a plurality of periods respectively switched to differentillumination modes according to a time management data DT, wherein thetime management data DT is related to biological clock. For example, thetime management data DT can be the mode-switching time data in thetiming diagram in FIG. 2D, which the disclosure is not limited to.Moreover, the light source apparatus 100 includes a data-writing systemDR, the time management data DT can be received and stored in a storageunit SV through the connection between the data-writing system DR andthe control unit 120, and the control unit 120 can control itself byloading the time management data DT from the storage unit SV to make alight source driving module DM drive the first portion P1 or the secondportion P2 so as to achieve the effect in the embodiment of FIG. 2A. Onthe other hand, the light source apparatus 100 further includes aconnection interface 140 to transmit the time management data DT fromthe data-writing system DR to the control unit 120, in which theconnection interface 140 is a cable connection interface or a wirelessconnection interface. For example, the connection interface 140 may be amanual switch or a remote, and the user UR can use the manual switch orthe remote to select or alter the illumination mode of the light sourceapparatus 100. The light source apparatus 100 can also automaticallyselect or alter the illumination mode depending on the time to meet therequirement of the user UR according to the content of the timemanagement data DT.

In the embodiment of FIG. 2A however, the light-emitting module 110 ofthe light source apparatus 100 can provide the first light L1 and thesecond light L2 with the same color temperatures but different CS/Pvalues; in other embodiments, the light-emitting module 110 of the lightsource apparatus 100 can provide the lights with the same or differentcolor temperatures and different CS/P values as well.

FIG. 4A is a schematic diagram of a light source apparatus in anotherembodiment of the disclosure. Similarly to the embodiment of FIG. 2A, alight source apparatus 300 in FIG. 4A includes a first light-emittingunit D1, a second light-emitting unit D2 and a third light-emitting unitD3, in which the third light-emitting unit D3 includes twolight-emitting units D31 and D32.

The first portion P1 of the light source apparatus 300 includes thefirst light-emitting unit D1, the second light-emitting unit D2 and thethird light-emitting unit D31 respectively corresponding to producingthe first sub-light beam W1, the second sub-light beam W2 and the thirdsub-light beam W3. The second sub-light beam W2 herein can be producedby a phosphor stimulated by the first sub-light beam W1 (at the time,the second light-emitting unit D2 can be a phosphor), while the thirdsub-light beam W3 is produced by a light-emitting diode (LED). Thesecond portion P23 of the light source apparatus 300 includes the firstlight-emitting unit D1 and the third light-emitting unit D32respectively corresponding to producing the first sub-light beam W1 andthe third sub-light beam W3, in which the first sub-light beam W1 can beproduced by an LED and the third sub-light beam W3 can be produced by aphosphor stimulated by the first sub-light beam W1 (at the time, thethird light-emitting unit D32 can be a phosphor). Herein, at least onerange of wave peaks of the first sub-light beam W1 is greater than 420nm but less than 480 nm, at least one range of wave peaks of the secondsub-light beam W2 can be greater than 480 nm but less than 540 nm, andat least one range of wave peaks of the third sub-light beam W3 can begreater than 540 nm.

In the embodiment of FIG. 4A, the difference from the above-mentionedembodiments rests in that, in the light source apparatus 300 of FIG. 4A,the control unit 320 makes the light B3 emitted from the light-emittingmodule 310 switched between a first light L13 and a second light L23, inwhich the color temperatures of the first light L13 and the second lightL23 are different from each other.

FIG. 4B is a diagram showing spectrum curve of the first light in theembodiment of FIG. 4A and FIG. 4C is a diagram showing spectrum curve ofthe second light in the embodiment of FIG. 4A. In the embodiment, theembodiment in FIG. 4B takes the color temperature of 6500K as anexample, while the embodiment in FIG. 4C takes the color temperature of3000K as an example. By the calculations on the spectrum curves in FIGS.4B and 4C through the related formulas, the CS/P value of the firstlight L13 provided by the light-emitting module 310 of the light sourceapparatus 300 is roughly 0.94 and the CS/P value of the second light L23is roughly 0.27. The CS/P value of the first light L13 herein is roughly3.48 times of the CS/P value of the second light L23, i.e., the CS/Pvalue of the first light L13 is greater than the CS/P value of thesecond light L23 by more than 5% of the CS/P value of the second lightL23.

FIG. 4D is a timing diagram showing different illumination modes indifferent periods for the light source apparatus in the embodiment ofFIG. 4A. The light source apparatus 300 of FIG. 4D can be used inresident lighting, as shown by FIG. 4D, the light-emitting module 310 ofthe light source apparatus 300 can provide a light source with a highCS/P value and high color temperature (6500K) in the daytime period (forexample, 9:00-18:00) so as to make a person feel fresh and boost thevitality and a light source with a low CS/P value and low colortemperature (3000K) in the evening period (for example, 18:00-22:00) soas to bring a person feeling of warmth and comfort. The above-mentionedCS/P values and the spectrum curves in FIGS. 4B and 4C herein areexamples used in the embodiment only, and they may be different in otherembodiments according to the real requirement, which the disclosure isnot limited to. In other embodiments, the light-emitting module mayprovide lights respectively having different correlated colortemperatures but having substantially the same CS/P value in differentmodes, or provide lights respectively having different or substantiallythe same optical parameters, which will be shown in the followingembodiments of FIGS. 15 to 22B.

FIG. 5A is a schematic diagram of a light source apparatus in yetanother embodiment of the disclosure. The light source apparatus in FIG.5A is similar to the embodiment in FIG. 2A, except that in theembodiment, a light-emitting module 410 further includes at least onefourth light-emitting unit D4, in which the first light-emitting unit D1provides a first sub-light beam W1, the second light-emitting unit D2provides a second sub-light beam W2, the third light-emitting unit D3provides a third sub-light beam W3 and the fourth light-emitting unit D4provides a fourth sub-light beam W4. As shown by FIG. 5A, the firstportion P14 can include the first light-emitting unit D1, the secondlight-emitting unit D2 and the fourth light-emitting unit D4; the secondportion P24 can include the first light-emitting unit D1, the thirdlight-emitting unit D3 and the fourth light-emitting unit D4. When thecontrol unit 420 makes the light-emitting module 410 switched to thefirst circadian stimulus mode, the first light-emitting unit D1 emitsthe first sub-light beam W1, the second light-emitting unit D2 emits thesecond sub-light beam W2 and the fourth light-emitting unit D4 emits thefourth sub-light beam W4; when the control unit 420 makes thelight-emitting module 410 switched to the second circadian stimulusmode, the first light-emitting unit D1 emits the first sub-light beamW1, the third light-emitting unit D3 emits the third sub-light beam W3and the fourth light-emitting unit D4 emits the fourth sub-light beamW4. The CS/P value of the first sub-light beam W1 herein is greater thanthe CS/P value of the second sub-light beam W2, and the CS/P value ofthe second sub-light beam W2 is greater than the CS/P value of the thirdsub-light beam W3. In short, under the first circadian stimulus mode,the first light L14 provided by the light-emitting module 410 of thelight source apparatus 400 can include the first sub-light beam W1, thesecond sub-light beam W2 and the fourth sub-light beam W4; under thesecond circadian stimulus mode, the second light L24 provided by thelight-emitting module 410 of the light source apparatus 400 can includethe first sub-light beam W1, the third sub-light beam W3 and the fourthsub-light beam W4 so as to achieve the similar effect to the lightsource apparatus 100 in the embodiment of FIG. 2A.

In other words, the light-emitting module 410 of the light sourceapparatus 400 can include the first light-emitting unit D1, the secondlight-emitting unit D2, the third light-emitting unit D3 and the fourthlight-emitting unit D4, in which at least the first light-emitting unitD1, the second light-emitting unit D2 and the fourth light-emitting unitD4 can form the first light source (i.e., the first portion P14) to emitthe first light L14, and the first light-emitting unit D1, the thirdlight-emitting unit D3 and the fourth light-emitting unit D4 can formthe second light source (i.e., the second portion P24) to emit thesecond light L24. The color temperatures of the first light L14 and thesecond light L24 emitted from the first light source and the secondlight source are substantially the same, but the first light L14 and thesecond light L24 have different CS/P values.

In the embodiment, the first light-emitting unit D1 in FIG. 5A can be anLED, the second sub-light beam W2 can be produced by a first phosphorstimulated by the first sub-light beam W1 and the third sub-light beamW3 can be produced by a second phosphor stimulated by the firstsub-light beam W1; that is to say, in the embodiment, the secondlight-emitting unit D2 and the third light-emitting unit D3 are made ofelectroluminescent light-emitting material (such as phosphor material),which can be stimulated by the first sub-light beam W1 to produce thesecond sub-light beam W2 and the third sub-light beam W3 with differentranges of wave peaks from each other. In addition, in the embodiment,the fourth light-emitting unit D4 can be, for example, an LED, but inother embodiments, the fourth light-emitting unit D4 may be made ofelectroluminescent light-emitting material (such as phosphor material)stimulated by light to produce the fourth sub-light beam W4, which thedisclosure is not limited to. In another embodiment, the firstlight-emitting unit D1, the second light-emitting unit D2, the thirdlight-emitting unit D3 and the fourth light-emitting unit D4 can be anLED or a combination of LED and phosphor with different ranges of wavepeaks.

FIG. 5B is a diagram showing spectrum curve of the first light in theembodiment of FIG. 5A, FIG. 5C is a diagram showing spectrum curve ofthe second light in the embodiment of FIG. 5A and FIG. 5D is a timingdiagram showing different illumination modes in different periods forthe light source apparatus in the embodiment of FIG. 5A. In moredetails, at least one range of wave peaks of the first sub-light beam W1is greater than 420 nm but less than 480 nm, at least one range of wavepeaks of the second sub-light beam W2 is greater than 480 nm but lessthan 540 nm, at least one range of wave peaks of the third sub-lightbeam W3 is greater than 540 nm but less than 590 nm and at least onerange of wave peaks of the fourth sub-light beam W4 is greater than 590nm but less than 680 nm. When the light source apparatus 400 is in thefirst circadian stimulus mode, the spectrum of the first light L14provided by the light-emitting module 410 is shown by the light-blendingspectrum curve in FIG. 5B; when the light source apparatus 400 is in thesecond circadian stimulus mode, the light-blending spectrum of thesecond light L24 provided by the light-emitting module 410 is shown bythe spectrum curve in FIG. 5C. In the embodiment, the color temperaturesin FIGS. 5B and 5C are, for example, 6500K. According to the spectrumcurves in FIGS. 5B and 5C, it can be deduced the CS/P value of the firstlight L14 provided by the light source apparatus 400 is roughly 0.94 andthe CS/P value of the second light L24 is roughly 0.79. Thus, the lightsource apparatus 400 can be used in working illumination (such ashospital or factory illumination) as shown by FIG. 5D. Thelight-emitting module 410 of the light source apparatus 400 can providea light source with high CS/P value and high color temperature indaytime period (for example, 9:00-18:00) so as to make stuff feel freshand boost the vitality, provide a light source with low CS/P value buthigh color temperature in evening period (for example, 18:00-22:00) soas to reduce the circadian stimulus on the stuff on evening duty so asto avoid affecting the health of the stuff. It should be noted that thespectrum curves in FIGS. 5B and 5C are used to describe the embodimentonly; in other embodiments, it can be different according to the realrequirement, which the disclosure is not limited to. The light sourceapparatus 400 in FIG. 5A can, similarly to the light source apparatus300 in the embodiment of FIG. 4A, provide the first light L14 and thesecond light L24 with different color temperatures and different CS/Pvalues with difference over 5% by adjusting the proportions between thefirst sub-light beam W1, the second sub-light beam W2, the thirdsub-light beam W3 and the fourth sub-light beam W4, which can refer tothe embodiments of FIGS. 2A and 4A and is omitted to describe.

FIG. 6A is a schematic diagram of a light source apparatus in yetanother embodiment of the disclosure and FIGS. 6B-6I are diagramsshowing spectrum curves of the lights provided by the light sourceapparatus 500 under various color temperature conditions. The lightsource apparatus in FIG. 6A is similar to the embodiment in FIG. 5A andthere are the first sub-light beam W1, the second sub-light beam W2, thethird sub-light beam W3 and the fourth sub-light beam W4 all which havethe same range of wave peaks, except that in the embodiment of FIG. 6A,the light-emitting module 510 of the light source apparatus 500 canprovide more sets of light sources with different color temperatures andhigh/low CS/P values under these illumination modes. For example, in theembodiment, when the first light-emitting units D11 and D12 in thelight-emitting module 510 of the light source apparatus 500 providefirst sub-light beams W1, the second light-emitting unit D2 provides thesecond sub-light beam W2 and the fourth light-emitting unit D4 providesthe fourth sub-light beam W4, the light-emitting module 510 of the lightsource apparatus 500 can respectively provide lights with higher CS/Pvalues, i.e., a first light L15 (for example, 6500K and 0.82 of CS/Pvalue), a third light L35 (for example, 5000K and 0.67 of CS/P value), afifth light L55 (for example, 4000K and 0.54 of CS/P value) and aseventh light L75 (for example, 3000K and 0.39 of CS/P value) accordingto the application requirement by adjusting the proportions between thefirst sub-light beam W1, the second sub-light beam W2 and the fourthsub-light beam W4; on the other hand, when the first light-emittingunits D11 and D13 in the light-emitting module 510 of the light sourceapparatus 500 provide first sub-light beams W1, the third light-emittingunit D3 provides the third sub-light beam W3 and the fourthlight-emitting unit D4 provides the fourth sub-light beam W4, thelight-emitting module 510 of the light source apparatus 500 canrespectively provide lights with lower CS/P values, i.e., a second lightL25 (6500K and 0.72 of CS/P value), a fourth light L45 (5000K and 0.57of CS/P value), a sixth light L65 (4000K and 0.45 of CS/P value) and aneighth light L85 (3000K and 0.30 of CS/P value) according to theapplication requirement by adjusting the proportions between the firstsub-light beam W1, the third sub-light beam W3 and the fourth sub-lightbeam W4. Thus, in comparison with the light-emitting modules 110 and110′ of the light source apparatuses 100 and 100′ in FIGS. 2A and 2C,the light-emitting module 510 of the light source apparatus 500 of theembodiment can provide more sets of light sources with different colortemperatures so as to meet various application requirements and havegood application potential.

In more details, in the embodiment, the light source apparatus 500 caninclude a first circadian stimulus mode, a second circadian stimulusmode, a third circadian stimulus mode, a fourth circadian stimulus mode,a fifth circadian stimulus mode, a sixth circadian stimulus mode, aseventh circadian stimulus mode and an eighth circadian stimulus mode.The control unit 520 makes the lights emitted by the light-emittingmodule 510 under these circadian stimulus modes respectively switchedbetween the first light L15 (corresponding to the spectrum curve shownby FIG. 6B), the second light L25 (corresponding to the spectrum curveshown by FIG. 6C), the third light L35 (corresponding to the spectrumcurve shown by FIG. 6D), the fourth light L45 (corresponding to thespectrum curve shown by FIG. 6E), the fifth light L55 (corresponding tothe spectrum curve shown by FIG. 6F), the sixth light L65 (correspondingto the spectrum curve shown by FIG. 6G), the seventh light L75(corresponding to the spectrum curve shown by FIG. 6H) and the eighthlight L85 (corresponding to the spectrum curve shown by FIG. 6I) so asto provide more sets of light sources.

In more details, the CS/P value of the second light L25 is less than theCS/P value of the first light L15 and the color temperatures of thesecond light L25 and the first light L15 are substantially the same; theCS/P value of the fourth light L45 is less than the CS/P value of thethird light L35 and the color temperatures of the fourth light L45 andthe third light L35 are substantially the same; the CS/P value of thesixth light L65 is less than the CS/P value of the fifth light L55 andthe color temperatures of the sixth light L65 and the fifth light L55are substantially the same; the CS/P value of the eighth light L85 isless than the CS/P value of the seventh light L75 and the colortemperatures of the eighth light L85 and the seventh light L75 aresubstantially the same. The color temperatures of the first light L15,the third light L35, the fifth light L55 and the seventh light L75 aresubstantially different, and the color temperatures of the second lightL25, the fourth light L45, the sixth light L65 and the eighth light L85are substantially different. In other words, the light-emitting module510 of the light source apparatus 500 can provide more sets of lightsources with different color temperatures by adjusting the proportionsbetween the first sub-light beam W1, the second sub-light beam W2, thethird sub-light beam W3 and the fourth sub-light beam W4. Specifically,the lights with the same color temperature of each of the sets can beswitched between a high CS/P value and a low CS/P value.

Moreover, in the embodiment, the light-emitting module 510 of the lightsource apparatus 500 can include three first light-emitting units D11,D12 and D13, a second light-emitting unit D2, a third light-emittingunit D3 and a fourth light-emitting unit D4, in which the firstlight-emitting units D11 and D12, the second light-emitting unit D2 andthe fourth light-emitting unit D4 form a first light source (i.e., thefirst portion P1) to emit the first light L15, the third light L35, thefifth light L55 and the seventh light L75 respectively under each of thecircadian stimulus modes. On the other hand, the first light-emittingunits D11 and D13, the third light-emitting unit D3 and the fourthlight-emitting unit D4 form a second light source (i.e., the secondportion P2) to emit the second light L25, the fourth light L45, thesixth light L65 and the eighth light L85 under each of the circadianstimulus modes.

In this way, by changing the light-blending proportions between thefirst sub-light beam W1, the second sub-light beam W2, the thirdsub-light beam W3 and the fourth sub-light beam W4, the light sourceapparatus 500 can, under the color temperature condition of 6500K, makethe light switched between the first light L15 with high CS/P value andthe second light L25 with low CS/P value; the light source apparatus 500can, under the color temperature condition of 5000K, make the lightswitched between the third light L35 with high CS/P value and the fourthlight L45 with low CS/P value; the light source apparatus 500 can, underthe color temperature condition of 4000K, make the light switchedbetween the fifth light L55 with high CS/P value and the sixth light L65with low CS/P value; the light source apparatus 500 can, under the colortemperature condition of 3000K, make the light switched between theseventh light L75 with high CS/P value and the eighth light L85 with lowCS/P value. As a result, the light source apparatus 500 has largerapplication potential.

The first light L15 and the second light L25 have the same colortemperature but different CS/P values, the third light L35 and thefourth light L45 have the same color temperature but different CS/Pvalues, the fifth light L55 and the sixth light L65 have the same colortemperature but different CS/P values, and the seventh light L75 and theeighth light L85 have the same color temperature but different CS/Pvalues. In other embodiments however, the first light L15 and the secondlight L25 can have different color temperatures, and the CS/P value ofthe first light L15 is greater than the CS/P value of the second lightL25 by over 5% of the CS/P value of the second light L25; the thirdlight L35 and the fourth light L45 have different color temperatures,and the CS/P value of the third light L35 is greater than the CS/P valueof the fourth light L45 by over 5% of the CS/P value of the fourth lightL45; the fifth light L55 and the sixth light L65 have different colortemperatures, and the CS/P value of the fifth light L55 is greater thanthe CS/P value of the sixth light L65 by over 5% of the CS/P value ofthe sixth light L65; the seventh light L75 and the eighth light L85 havedifferent color temperatures, and the CS/P value of the seventh lightL75 is greater than the CS/P value of the eighth light L85 by over 5% ofthe CS/P value of the eighth light L85. In this way, it has the effectsame as the light source apparatus 500 in FIG. 6A.

FIG. 6J is a timing diagram showing different illumination modes indifferent periods for the light source apparatus in the embodiment ofFIG. 6A. Referring to FIG. 6J, the light source apparatus 500, forexample, is used in office illumination, in which the light sourceapparatus 500 in the daytime period (8:00-11:00 as shown by FIG. 6J) canbe switched to the first circadian stimulus mode to make thelight-emitting module 510 provide the first light L15 with high colortemperature (6500K) and high CS/P value; in the lunch break period(11:00-13:00), the light source apparatus 500 is switched to the secondcircadian stimulus mode to make the light-emitting module 510 providethe second light L25 with high color temperature and low CS/P value soas to reduce the circadian stimulus on the stuff during rest; in theafternoon period after the lunch break (13:00-16:00), the light sourceapparatus 500 is switched back to the first circadian stimulus mode toadvance the working efficiency; in the evening period after off work(after 18:00 as shown by FIG. 6J), the light source apparatus 500 isswitched to the seventh circadian stimulus mode to make thelight-emitting module 510 provide the seventh light L75 with low colortemperature (3000K); in the sleeping night period (after 22:00 as shownby FIG. 6J), the light source apparatus 500 is switched to the eighthcircadian stimulus mode to make the light-emitting module 510 providethe eight light L85 with low color temperature (3000K) and the lowestCS/P value. In addition, the light source apparatus 500 can provide morecombinations of light sources for more wide applications.

FIG. 7 is a schematic diagram of a light source apparatus in anotherembodiment of the disclosure, FIG. 8A is spectra of the first light andthe lights respectively emitted from the light-emitting units in thefirst illumination mode in FIG. 7, FIG. 8B is spectra of the secondlight and the lights respectively emitted from the light-emitting unitsin the second illumination mode in FIG. 7, and FIG. 9 is the colorcoordinates of the first light and the second light in FIG. 7 in the CIE1976 u′-v′ diagram. In FIGS. 8A and 8B, the horizontal axis representswavelengths with the unit of nanometer (nm), and the vertical axisrepresents spectrum intensity having an arbitrary unit. Referring toFIGS. 7, 8A, 8B, and 9, the light source apparatus 100 a in thisembodiment is similar to the light source apparatus 100 in FIG. 2A, andthe main difference therebetween is that in the light source apparatus100 a, a spectrum of the first light L1 is different from a spectrum ofthe second light L2, and color temperatures of the first light L1 andthe second light L2 are substantially the same as each other, but thecircadian stimulus values of the first light L1 and the second light L2are not considered.

In this embodiment, the light source apparatus 100 a includes alight-emitting module 110 a and a control unit 120. The light-emittingmodule is configured to provide a light B. The control unit 120 makesthe light B emitted from the light-emitting module 110 a switchedbetween a first light L1 and a second light L2. A spectrum of the firstlight L1 (see FIG. 8A) is different from a spectrum of the second lightL2 (see FIG. 8B), and color temperatures (see FIG. 9) of the first lightL1 and the second light L2 are substantially the same as each other.Referring to FIG. 9, the color coordinate of the first light L1 and thecolor coordinate of the second light L2 is substantially located on thesame line representing the correlated color temperature (CCT) of 3000 K.

In this embodiment, the control unit 120 makes the light-emitting module110 a switched between a plurality of illumination modes. Theillumination modes include a first illumination mode and a secondillumination mode. The light-emitting module 110 a includes a pluralityof light-emitting units, e.g. a first light-emitting unit D1, a secondlight-emitting unit D2, a third light-emitting unit D3, a fourthlight-emitting unit D4, and a fifth light-emitting unit D5. When thecontrol unit 120 switches the light-emitting module 110 a to the firstillumination mode, the control unit 120 makes a first portion or all ofthe light-emitting units emit the first light L1. In this embodiment,when the control unit 120 switches the light-emitting module 110 a tothe first illumination mode, the control unit 120 makes all of thelight-emitting units, including the first to fifth light-emitting unitsD1-D5, emit the first light L1. When the control unit 120 switches thelight-emitting module 110 a to the second illumination mode, the controlunit 120 makes a second portion P2 of the light-emitting units (e.g.,including the first to fourth light-emitting units D1-D4) emit thesecond light L2. The first portion and the second portion are partiallythe same as each other or totally different from each other.

The light-emitting units, e.g. the first to fifth light-emitting units,include electroluminescent light-emitting element, light-inducedlight-emitting element or a combination thereof.

In this embodiment, the light-emitting module 110 a includes at leastone first light-emitting unit D1, at least one second light-emittingunit D2, at least one third light-emitting unit D3, at least one fourthlight-emitting unit D4, and at least one fifth light-emitting unit D5.The first light-emitting unit D1 provides a first sub-light beam W1, thesecond light-emitting unit D2 provides a second sub-light beam W2, thethird light-emitting unit D3 provides a third sub-light beam W3, thefourth light-emitting unit D4 provides a fourth sub-light beam W4, andthe fifth light-emitting unit D5 provides a fifth sub-light beam W5. Thesecond portion P2 at least includes the first light-emitting unit D1,the second light-emitting unit D2, the third light-emitting unit D3, andthe fourth light-emitting unit D4.

When the control unit 120 switches the light-emitting module 110 a tothe first illumination mode, the first light-emitting unit D1 emits thefirst sub-light beam W1, the second light-emitting unit D2 emits thesecond sub-light beam W2, the third light-emitting unit D3 emits thethird sub-light beam W3, the fourth light-emitting unit D4 emits thefourth sub-light beam W4, and the fifth light-emitting unit D5 emits thefifth sub-light beam W5. When the control unit 120 switches thelight-emitting module 110 a to the second illumination mode, the firstlight-emitting unit D1 emits the first sub-light beam W1, the secondlight-emitting unit D2 emits the second sub-light beam W2, the thirdlight-emitting unit D3 emits the third sub-light beam W3, and the fourthlight-emitting unit D4 emits the fourth sub-light beam W4. Moreover, thefifth sub-light beam W5 is an invisible light beam.

In this embodiment, one of the first light L1 and the second light L2may contain an invisible light. For example, the first sub-light beamW1, the second sub-light beam W2, the third sub-light beam W3, and thefourth sub-light beam W4 may be visible light beams, and the fifthsub-light beam W5 is an invisible light beam. Specifically, in thisembodiment, the first sub-light beam W1 is a blue light beam, the secondsub-light beam W2 is a green light beam, the third sub-light beam W3 isa yellow light beam, the fourth sub-light beam W4 is a red light beam,and the fifth sub-light beam W5 is an ultraviolet light beam. Moreover,in this embodiment, the first light-emitting unit D1 is a firstlight-emitting diode (LED), the second light-emitting unit D2 is a firstphosphor, the third light-emitting unit D3 is a second phosphor, thefourth light-emitting unit D4 is a third phosphor, and the fifthlight-emitting unit D5 is a second LED. The second sub-light beam W2 isproduced by the first phosphor stimulated by the first sub-light beamW1, the third sub-light beam W3 is produced by the second phosphorstimulated by the first sub-light beam W1, and the fourth sub-light beamW4 is produced by the third phosphor stimulated by the first sub-lightbeam W1. In this embodiment, the first, second, and third phosphors maybe doped in an encapsulant wrapping the first light-emitting unit D1,i.e. the first LED.

In this embodiment, the first light L1 contains the UV light beam, butthe second light L2 does not contain the UV light beam. Therefore, whenthe light-emitting module 110 a is switched to the first illuminationmode, the light-emitting module 110 a emits the first light L1containing a white light and the UV light, so that the first light L1 isadapted to illuminate products containing the fluorescent whiteningagent, for example, textile products. When the light-emitting module 110a is switched to the second illumination mode, the light-emitting module110 a emits the second light L2 containing a white light but not the UVlight, so that the second light L2 is adapted to illuminate leathershoes, leather products, works of art, etc. which are easy to be damagedby the UV light. Moreover, in the light source apparatus 100 a accordingto this embodiment, since the color temperatures of the first light L1and the second light L2 are substantially the same as each other, when aplurality of light source apparatuses 100 a or light-emitting modules110 a are disposed in the same exhibition space and respectively emitthe first light L1 and the second light L2, the light color of the lightsource apparatuses 100 a or light-emitting modules 110 a is uniform, andthe first light L1 and the second light L1 may respectively achievedifferent functions.

In another embodiment, the first sub-light beam W1 is a blue light beam,the second sub-light beam W2 may be a cyan light beam, the thirdsub-light beam W3 may be a lime color light beam, the fourth sub-lightbeam W4 is a red light beam, and the fifth sub-light beam W5 is anultraviolet light beam, so that the spectrum of the second light L2 ismore similar to a continuous spectrum of natural white light.

In yet another embodiment, the fifth sub-light beam W5 may be aninfrared light beam, and the infrared light beam may be used in apositioning system. As a result, the first light L1 can be used for bothillumination and positioning.

FIG. 10 is a schematic diagram of a light source apparatus in anotherembodiment of the disclosure, FIG. 11A is spectra of the first light andthe lights respectively emitted from the light-emitting units in thefirst illumination mode in FIG. 10, FIG. 11B is spectra of the secondlight and the lights respectively emitted from the light-emitting unitsin the second illumination mode in FIG. 10, and FIG. 12 is the colorcoordinates of the first light and the second light in FIG. 10 in theCIE 1976 u′-v′ diagram. In FIGS. 11A and 11B, the horizontal axisrepresents wavelengths with the unit of nanometer (nm), and the verticalaxis represents spectrum intensity having an arbitrary unit. Referringto FIGS. 10, 11A, 11B, and 12, the light source apparatus 100 b in thisembodiment is similar to the light source apparatus 100 a in FIG. 7, andthe main difference therebetween is as follows.

In this embodiment, the general color rendering index (CRI) of the firstlight L1′ is greater than that of the second light L2′. The general CRIis defined as the average of CRI R1 to CRI R8, and is denoted as “Ra”.Moreover, in this embodiment, the light emitting efficiency of thesecond light L2′ is greater than that of the first light L1′.

In this embodiment, the light-emitting module 100 b includes at leastone first light-emitting unit D1′, at least one second light-emittingunit D2′, at least one third light-emitting unit D3′, at least onefourth light-emitting unit D4′, at least one fifth light-emitting unitD5′, and at least one sixth light-emitting unit D6′. The firstlight-emitting unit D1′ provides a first sub-light beam W1′, the secondlight-emitting unit D2′ provides a second sub-light beam W2′, the thirdlight-emitting unit D3′ provides a third sub-light beam W3′, the fourthlight-emitting unit D4′ provides a fourth sub-light beam W4′, the fifthlight-emitting unit D5′ provides a fifth sub-light beam W5′, and thesixth light-emitting unit D6′ provides a sixth sub-light beam W6′.

When the control unit 120 switches the light-emitting module 110 b to afirst illumination mode, the control unit 120 makes a first portion P1′of the light-emitting units (e.g. the first, second, third, and fourthlight-emitting units D1′, D2′, D3′, and D4′) emit the first light L1′.When the control unit 120 switches the light-emitting module 110 b to asecond illumination mode, the control unit 120 makes a second portionP2′ of the light-emitting units (e.g. the first, fifth, and sixthlight-emitting units Dr, D5′, and D6′) emit the second light L2′. Thefirst portion P1′ and the second portion P2′ are partially the same aseach other or totally different from each other. In this embodiment, thefirst portion Pr and the second portion P2′ are partially the same aseach other since both the first portion P1′ and the second portion P2′contain the first light-emitting unit D1′.

The first portion Pr at least includes the first light-emitting unit Dr,the second light-emitting unit D2′, the third light-emitting unit D3′,and the fourth light-emitting unit D4′. The second portion P2′ at leastincludes the first light-emitting unit D1′, the fifth light-emittingunit D5′, and the sixth light-emitting unit D6′. When the control unit120 switches the light-emitting module 110 b to the first illuminationmode, the first light-emitting unit D1′ emits the first sub-light beamWr, the second light-emitting unit D2′ emits the second sub-light beamW2′, the third light-emitting unit D3′ emits the third sub-light beamW3′, and the fourth light-emitting unit D4′ emits the fourth sub-lightbeam W4′. When the control unit 120 switches the light-emitting module110 b to the second illumination mode, the first light-emitting unit Dremits the first sub-light beam W1′, the fifth light-emitting unit D5′emits the fifth sub-light beam W5′, and the sixth light-emitting unitD6′ emits the sixth sub-light beam W6′.

In this embodiment, the first sub-light beam W1′ is a blue light beam,the second sub-light beam W2′ is a green light beam, the third sub-lightbeam W3′ is a yellow light beam, the fourth sub-light beam W4′ is a redlight beam, the fifth sub-light beam W5′ is a red light beam, and thesixth sub-light beam W6′ is a lime color light beam.

In this embodiment, the first light-emitting unit D1′ is a first LED,the second light-emitting unit D2′ is a first phosphor, the thirdlight-emitting unit D3′ is a second phosphor, the fourth light-emittingunit D4′ is a third phosphor, the fifth light-emitting unit D5′ is asecond LED, and the sixth light-emitting unit D6′ is a fourth phosphor.The first phosphor, the second phosphor, and the third phosphor arestimulated by a light (e.g. a seventh sub-light beam W7′) emitted by aseventh light-emitting unit D7′ (e.g. a third LED) to respectively emitthe second sub-light beam W2′, the third sub-light beam W3′, and thefourth sub-light beam W4′. The fourth phosphor is stimulated by a light(e.g. an eighth sub-light beam W8′) emitted by an eighth light-emittingunit D8′ (e.g. a fourth LED) to emit the sixth sub-light beam W6′. Inthis embodiment, the seventh sub-light beam W7′ and the eighth sub-lightbeam W8′ are, for example, blue light beams. In this embodiment, thefirst phosphor, the second phosphor, and the third phosphor may be dopedin an encapsulant 113 wrapping the seventh light-emitting unit D7′, andthe fourth phosphor may be doped in an encapsulant 115 wrapping theeighth light-emitting unit D8′.

In this embodiment, the general CRI of the first light L1′ is greaterthan 90 and is greater than that of the second light L2′, but the lightemitting efficiency of the second light L2′ is greater than that of thefirst light L1′. Therefore, when the light-emitting module 110 b isswitched to the first illumination mode, the light-emitting module 110 bemits the first light L1′ having higher general CRI, so that the firstlight L1′ is adapted to illuminate fresh food. As a result, the freshfood may have better color. When the light-emitting module 110 b isswitched to the second illumination mode, the light-emitting module 110b emits the second light L2′ having higher light emitting efficiency, sothat the second light L2′ is adapted to be used in the situation wherethe light emitting efficiency is concerned more. As shown in FIGS. 11A,11B, and 12, the first light L1′ (FIG. 11A) and the second light L2′(FIG. 11B) have different spectrum, but have substantially the samecolor temperature (FIG. 12). In FIG. 12, the color coordinate of thefirst light L1′ and the color coordinate of the second light L2′ aresubstantially located on the same line representing the correlated colortemperature between 2500 K and 3000 K. Moreover, the spectrum of thesecond light L2′ has a low circadian stimulus value and a low blue LightHazard.

FIG. 13A is spectra of the first light and the lights respectivelyemitted from the light-emitting units in the first illumination mode inFIG. 10 according to another embodiment of the disclosure, FIG. 13B isspectra of the second light and the lights respectively emitted from thelight-emitting units in the second illumination mode in FIG. 10according to another embodiment of the disclosure, and FIG. 14 is thecolor coordinates of the first light and the second light in FIG. 10 inthe CIE 1976 u′-v′ diagram according to another embodiment of thedisclosure. In FIGS. 13A and 13B, the horizontal axis representswavelengths with the unit of nanometer (nm), and the vertical axisrepresents spectrum intensity having an arbitrary unit. Referring toFIGS. 10, 13A, 13B, and 14, the structure of the light source apparatus100 b in this embodiment is substantially the same as that of the lightsource apparatus 100 b in the embodiment of FIGS. 10, 11A, 11B, and 12,but the main difference therebetween is that the spectra of the firstlight L1′ and the second light L2′ in this embodiment (shown in FIGS.13A and 13B) are different from the spectra of the first light L1′ andthe second light L2′ in the embodiment of FIGS. 10, 11A, 11B, and 12(shown in FIGS. 11A and 11B).

In this embodiment, the CRI R14 of the first light L1′ is greater thanthat of the second light L2′, and the CRI R13 of the second light L2′ isgreater than that of the first light L1′. Specifically, in thisembodiment, the CRI R14 of the first light L1′ is greater than 90, andthe CRI R13 of the second light L2′ is greater than 90. Moreover, inthis embodiment, both the general CRIs of the first light L1′ and thesecond light L2′ are greater than 84.

In this embodiment, when the light-emitting module 110 b is switched tothe first illumination mode, the light-emitting module 110 b emits thefirst light L1′ having the higher CRI R14, so that the first light L1′is adapted to illuminate green plants. As a result, the green plants mayhave better color. When the light-emitting module 110 b is switched tothe second illumination mode, the light-emitting module 110 b emits thesecond light L2′ having the higher CRI R13, so that the second light L2′is adapted to illuminate a human face or portrait, and the human face orthe portrait may have better color. As shown in FIGS. 13A, 13B, and 14,the first light L1′ (FIG. 13A) and the second light L2′ (FIG. 13B) havedifferent spectrum, but have substantially the same color temperature(FIG. 14). In FIG. 14, the color coordinate of the first light L1′ andthe color coordinate of the second light L2′ are substantially locatedon the same line representing the correlated color temperature of 4000K.

The light-emitting units in aforementioned embodiments are not limitedto be LEDs or phosphors. In other embodiments, the aforementionedlight-emitting units may be organic light-emitting diodes (OLEDs) orother appropriate light-emitting devices.

FIG. 15 is a schematic diagram of a light source apparatus in anotherembodiment of the disclosure, FIG. 16A is spectra of sub-lights emittedby light-emitters in FIG. 15, and FIG. 16B is a graph of the circadianaction factor vs. correlated color temperature of light emitted from thelight-emitting module in FIG. 15. Referring to FIGS. 15, 16A, and 16B,the light source apparatus 600 in this embodiment includes alight-emitting module 610 and a control unit 620. The light-emittingmodule 610 is configured to provide a light B6. The control unit 620makes the light B6 emitted from the light-emitting module 610 switchedamong a plurality of kinds of first light. Correlated color temperatures(CCTs) of the plurality of kinds of first light are different from eachother, and circadian action factors of the plurality of kinds of firstlight are substantially the same as each other. The circadian actionfactor is the aforementioned CS/P value. For example, in FIG. 16B, ablack square dot means the circadian action factor and the CCT of a kindof first light, and black square dots substantially aligned along ahorizontal line in FIG. 16B means the circadian action factors and theCCTs respectively belonging to a plurality of kinds of first light. That“the circadian action factors of the plurality of kinds of first lightare substantially the same as each other” means that the variations ofthe circadian action factors are within ±20% of the average of thecircadian action factors, preferably within ±10% of the average of thecircadian action factors.

In this embodiment, the light-emitting module 610 includes a pluralityof light emitters E1, E2, E3, E41, and E42 respectively emittingsub-lights V1, V2, V3, V41, and V42 with different wavelength ranges,and the sub-lights V1, V2, V3, V41, and V42 form the light B6 providedby the light-emitting module 610. The light B6 emitted from thelight-emitting module 610 are switched among the plurality of kinds offirst light by changing proportions of the sub-lights V1, V2, V3, V41,and V42. The light-emitters E1, E2, E3, E41, and E42 include anelectroluminescent light-emitting element, a light-inducedlight-emitting element or a combination thereof. The electroluminescentlight-emitting element is, for example, a light-emitting diode (LED)chip, and the light-induced light-emitting element is, for example,phosphor. In this embodiment, the light-emitters E1, E2, E3, and E41 arelight-emitting diode chips, and the light-emitter E42 is phosphor.Moreover, the light-emitter E41 and the light-emitter E42 form a lightemitter E4, wherein the light-emitter E41 is, for example, a blue LEDchip, the light-emitter E42 is, for example, yttrium aluminum garnet(YAG) phosphor, and the light-emitter E4 is a white LED. That is, thesub-light V41 is a blue sub-light, the sub-light V42 is a yellowsub-light, the sub-light V41 and the sub-light V42 form the sub-lightV4, and the sub-light V4 is a white sub-light. Specifically, when thesub-light V41 from the light-emitter E41 irradiates the light-emitterE42, the light-emitter E42 converts the sub-light V41 into the sub-lightV42. The sub-light V42 and the unconverted sub-light V41 form thesub-light V4.

In this embodiment, the peak wavelength of the sub-light V1 falls withinthe range of 460 nanometer (nm) to 470 nm, the peak wavelength of thesub-light V2 falls within the range of 515 nm to 525 nm, the peakwavelength of the sub-light V3 falls within the range of 620 nm to 630nm, and the sub-light V4 is a white light with a CCT of 3100 K. In thisembodiment, a full width at half maximum (FWHM) of each of sub-lightsV1, V2, and V3 emitted by the light-emitting diode chips is less than 40nanometers. For example, the FWHM of the sub-light V1 is 25 nm, the FWHMof the sub-light V2 is 32 nm, the FWHM of the sub-light V3 is 18 nm, andthe FWHM of the sub-light V4 is 74 nm, wherein the sub-light V4 includesthe sub-light V42 and the unconverted sub-light V41. In this embodiment,the sub-lights V1, V2, V3, and V4 are visible lights, but the disclosureis not limited thereto.

The control unit 620 is configured to change the proportions ofintensities of the sub-lights V1, V2, V3, V4 by changing the currents orvoltages respectively applied to the light-emitters E1, E2, E3, and E41,so that the light B6 may be switched among the plurality of kinds offirst light. In this embodiment, the proportions of the sub-lights V1,V2, V3, and V4 are changed by pulse width modulation of the lightemitters E1, E2, E3, and E41. For example, when the CS/P value of thelight B6 is 0.8 as shown in FIG. 16B, the CCT of the light B6 may bemodulated from 3750 K to 5500 K by the control unit 620 executing pulsewidth modulation. When the CS/P value is 0.8 and the CCT is 3750 K, theratio of the duty cycles of pulse width modulation of the light emittersE1, E2, E3, and E41 is 3:18:17:2, for example. When the CS/P value is0.8 and the CCT is 5500 K, the ratio of the duty cycles of pulse widthmodulation of the light emitters E1, E2, E3, and E41 is 13:11:0:20, forexample.

In this embodiment, each of Duv values of the plurality of kinds offirst light is less than 0.005. For the color consistency of whitelight, the standard CCT has still an allowable range of variation inchromaticity. The Duv, defined as the variations perpendicular to thePlanckian locus on the CIE 1976 color space, is used to illustrate thevariation in chromaticity. In usual, the color inconsistency cannot bereadily discerned by viewers if the Duv is lower than 0.005.

FIG. 16C is a graph of the color rendering index vs. correlated colortemperature of light emitted from the light-emitting module in FIG. 15.Referring to FIGS. 15, 16A, and 16C, in this embodiment, the controlunit 620 also makes the light B6 emitted from the light-emitting module610 switched among a plurality of kinds of second light, whereincorrelated color temperatures (CCTs) of the plurality of kinds of secondlight are different from each other, and color rendering indices (CRIs)of the plurality of kinds of second light are substantially the same aseach other. For example, in FIG. 16C, a black square dot means the CRIand the CCT of a kind of second light, and black square dotssubstantially aligned along a horizontal line in FIG. 16C means the CRIsand the CCTs respectively belonging to a plurality of kinds of secondlight. That “the CRIs of the plurality of kinds of second light aresubstantially the same as each other” means that the variations of theCRIs are within ±5. In this embodiment, each of Duv values of theplurality of kinds of second light is less than 0.005. In thisembodiment, when the CRI of the light B6 is 85, the CCT of the light B6may be modulated from 2700 K to 6500 K by the control unit 620 executingpulse width modulation.

In this embodiment, the control unit 620 also makes the light B6 emittedfrom the light-emitting module 610 switched among a plurality of kindsof third light, wherein correlated color temperatures (CCTs) of theplurality of kinds of third light are substantially the same as eachother, and color rendering indices (CRIs) or circadian action factors(i.e. CS/P values) of the plurality of kinds of third light aredifferent from each other. That “the CCTs are substantially the same” of“the correlated color temperatures (CCTs) of the plurality of kinds ofthird light are substantially the same as each other” is defined thesame as the definition of the color temperatures being substantially thesame in paragraph [0052] and Tab 2. In this embodiment, a black squaredot in FIG. 16B or in FIG. 16C means the CS/P value and the CCT of akind of third light or the CRI and the CCT of a kind of third light, andblack square dots substantially aligned along a vertical line in FIG.16B or 16C means the CS/P values and the CCTs respectively belonging toa plurality of kinds of third light, or the CRIs and the CCTsrespectively belonging to a plurality of kinds of third light. Moreover,in this embodiment, each of Duv values of the plurality of kinds ofthird light is less than 0.005. For example, when the CCT is 3000 K, theCS/P value of the light B6 may be modulated from 0.3 to 0.6 by thecontrol unit 620 executing pulse width modulation. Besides, when the CCTis 3000 K, the CRI of the light B6 may be modulated from 55 to 93 by thecontrol unit 620 executing pulse width modulation.

The control unit 620 may also make the light B6 emitted from thelight-emitting module 610 switched among a plurality of kinds of fourthlight, circadian action factors (i.e. CS/P values) of the plurality ofkinds of fourth light cover or are substantially the same as circadianaction factors of sunlight within a correlated color temperature range,wherein the correlated color temperature range comprises a range of 3000K to 6500 K. The gray square dots and the gray line in FIG. 16B show thecircadian action factors respectively corresponding to CCTs of sunlight,and all the black square dots in FIG. 16B show the circadian actionfactors respectively corresponding to CCTs of the plurality of kinds offourth light. FIG. 16D is a graph of the circadian action factor vs.correlated color temperature of sunlight. Referring to FIGS. 15, 16A,16B, and 16D, in this embodiment, the area of the black square dots inFIG. 16B cover the gray square dots and the gray line, which means thatthe circadian action factors (i.e. CS/P values) of the plurality ofkinds of fourth light cover the circadian action factors of sunlightwithin the correlated color temperature range, e.g. a CCT range from3000 K to 6500 K. Moreover, in this embodiment, each of Duv values ofthe plurality of kinds of fourth light is less than 0.005.

In this embodiment, the light B6 emitted from the light-emitting module610 are switched among the plurality of kinds of first light, theplurality of kinds of second light, the plurality of kinds of thirdlight, and the plurality of kinds of fourth light by changingproportions of the sub-lights V1, V2, V3, and V4 through the controlunit 620 executing the aforementioned pulse width modulation.

In the light source apparatus 600 according to this embodiment, sincethe light B6 emitted from the light-emitting module 610 may be switchedamong the plurality of kinds of first light, the plurality of kinds ofsecond light, the plurality of kinds of third light, and the pluralityof kinds of fourth light, the light source apparatus 600 may have moreapplications.

FIG. 17 is a schematic diagram of a light source apparatus in anotherembodiment of the disclosure, FIG. 18A is spectra of sub-lights emittedby light-emitters in FIG. 17, and FIG. 18B is a graph of the circadianaction factor vs. correlated color temperature of light emitted from thelight-emitting module in FIG. 17. FIG. 18C is a graph of the colorrendering index vs. correlated color temperature of light emitted fromthe light-emitting module in FIG. 17, wherein the white square dots showthe color rendering indices and the corresponding correlated colortemperatures of light B6 emitted from the light-emitting module in FIG.17. Referring to FIGS. 17, 18A, 18B, and 18C, the light source apparatus600 a in this embodiment is similar to the light source apparatus 600 inFIG. 15, and the main difference therebetween is as follows. In thisembodiment, a light-emitting module 610 a includes a plurality of lightemitters E11 a, E12 a, E2 a, E3 a, E4 a, E5 a, E6 a, and E7 arespectively emitting sub-lights V11 a, V12 a, V2 a, V3 a, V4 a, V5 a,V6 a, and V7 a with different wavelength ranges, and the sub-lights V11a, V12 a, V2 a, V3 a, V4 a, V5 a, V6 a, and V7 a form the light B6provided by the light-emitting module 610 a. In this embodiment, thelight-emitters E11 a, E2 a, E3 a, E4 a, E5 a, E6 a, and E7 a arelight-emitting diode chips, and the light-emitter E12 a is phosphor.Moreover, the light-emitter E11 a and the light-emitter E12 a form alight emitter E1 a, wherein the light-emitter E12 a is, for example,phosphor with lime color. When the sub-light V11 a from thelight-emitter E11 a irradiates the light-emitter E12 a, thelight-emitter E12 a converts the sub-light V11 a into the sub-light V12a. The sub-light V12 a and the unconverted sub-light V11 a from thesub-light V1 a. In this embodiment, almost all the sub-light V11 a isconverted into the sub-light V12 a by the light-emitter E12 a, and theunconverted sub-light V11 a can be neglected, so that the sub-light V1 amay be deemed having lime color.

In this embodiment, the peak wavelength of the sub-light V1 a fallswithin the range of 550 nm to 560 nm, the peak wavelength of thesub-light V2 a falls within the range of 440 nm to 450 nm, the peakwavelength of the sub-light V3 a falls within the range of 460 nm to 470nm, the peak wavelength of the sub-light V4 a falls within the range of490 nm to 500 nm, the peak wavelength of the sub-light V5 a falls withinthe range of 520 nm to 530 nm, the peak wavelength of the sub-light V6 afalls within the range of 610 nm to 620 nm, and the peak wavelength ofthe sub-light V7 a falls within the range of 650 nm to 670 nm. Moreover,the FWHM of the sub-light V1 a is 93 nm, the FWHM of the sub-light V2 ais 16 nm, the FWHM of the sub-light V3 a is 20 nm, the FWHM of thesub-light V4 a is 22 nm, the FWHM of the sub-light V5 a is 28 nm, theFWHM of the sub-light V6 a is 14 nm, and the FWHM of the sub-light V7 ais 15 nm, for example.

The control unit 620 is configured to change the proportions ofintensities of the sub-lights V1 a, V2 a, V3 a, V4 a, V5 a, V6 a, and V7a by changing the currents or voltages respectively applied to thelight-emitters E11 a, E2 a, E3 a, E4 a, E5 a, E6 a, and E1 a, so thatthe light B6 may be switched among a plurality of kinds of first light,a plurality of kinds of second light, a plurality of kinds of thirdlight, and a plurality of kinds of fourth light. In this embodiment, theproportions of the sub-lights V1 a, V2 a, V3 a, V4 a, V5 a, V6 a, and V7a are changed by pulse width modulation of the light emitters E11 a, E2a, E3 a, E4 a, E5 a, E6 a, and E1 a. For example, when the CS/P value ofthe light B6 is 0.7 as shown in FIG. 18B, the CCT of the light B6 may bemodulated from 2700K to 6500K by the control unit 620 executing pulsewidth modulation. When the CRI of the light B6 is 93, the CCT of thelight B6 may be modulated from 2700K to 6500K by the control unit 620executing pulse width modulation. In addition, when the CCT of the lightB6 is 6000 K, the CS/P value of the light B6 may be modulated from 0.62to 1.4 by the control unit 620 executing pulse width modulation. Whenthe CCT of the light B6 is 6000 K, the CRI of the light B6 may bemodulated from 1 to 98 by the control unit 620 executing pulse widthmodulation. In this embodiment, each of Duv values of the plurality ofkinds of first light, the plurality of kinds of second light, theplurality of kinds of third light, and the plurality of kinds of fourthlight is less than 0.005.

FIGS. 19A to 19D are graphs of the circadian action factor vs.correlated color temperature of light emitted from the light-emittingmodule in FIG. 17 respectively when the CRIs thereof are greater than80, 90, 93, and 95. Referring to FIGS. 17, 18B, and 19A to 19D, thecontrol unit 620 may also make the light B6 emitted from thelight-emitting module 610 a switched among a plurality of kinds offourth light, circadian action factors (i.e. CS/P values) of theplurality of kinds of fourth light cover or are substantially the sameas circadian action factors of sunlight within a correlated colortemperature range, wherein the correlated color temperature range is,for example, a range of 3000 K to 6500 K. The gray square dots and thegray line in FIGS. 18B and 19A to 19D show the circadian action factorsrespectively corresponding to CCTs of sunlight, and all the black squaredots in FIGS. 18B and 19A to 19D show the circadian action factorsrespectively corresponding to CCTs of the plurality of kinds of fourthlight. In FIGS. 18B, 19A, and 19B, the circadian action factors (i.e.CS/P values) of the plurality of kinds of fourth light cover thecircadian action factors of sunlight within the correlated colortemperature range, e.g. a CCT range from 3000 K to 6500 K. In theembodiment of FIG. 19A, each of the color rendering indices of theplurality of kinds of fourth light is greater than 80. Besides, in FIGS.19C and 19D, the circadian action factors (i.e. CS/P values) of theplurality of kinds of fourth light are substantially the same as thecircadian action factors of sunlight within the correlated colortemperature range, e.g. a CCT range from 3000 K to 6500 K, wherein That“the circadian action factors (i.e. CS/P values) of the plurality ofkinds of fourth light are substantially the same as the circadian actionfactors of sunlight” means that the deviations of the circadian actionfactors of the plurality of kinds of fourth light from the circadianaction factors of sunlight at corresponding CCTs are respectively within±20% of the circadian action factors at the corresponding CCTs,preferably within ±10% of the circadian action factors at thecorresponding CCTs.

FIG. 20 is a schematic diagram of a light source apparatus in anotherembodiment of the disclosure, FIG. 21A is spectra of sub-lights emittedby light-emitters in FIG. 20, and FIG. 21B is a graph of the circadianaction factor vs. correlated color temperature of light emitted from thelight-emitting module in FIG. 20. FIG. 21C is a graph of the colorrendering index vs. correlated color temperature of light emitted fromthe light-emitting module in FIG. 20, wherein the white square dots showthe color rendering indices and the corresponding correlated colortemperatures of light B6 emitted from the light-emitting module in FIG.20. Referring to FIGS. 20 and 21A to 21C, the light source apparatus 600b in this embodiment is similar to the light source apparatus 600 a inFIG. 17, and the main difference therebetween is as follows. In thisembodiment, a light emitter E1 b is used to replace the light emitter E1a in FIG. 17. The light emitter E1 b is, for example, a light-emittingdiode chip, and the peak wavelength of the sub-light V1 b emitted by thelight emitter E1 a falls within the range of 550 nm to 560 nm. The FWHMof the sub-light V1 b is, for example, 28 nm.

The control unit 620 is configured to change the proportions ofintensities of the sub-lights V1 b, V2 a, V3 a, V4 a, V5 a, V6 a, and V7a by changing the currents or voltages respectively applied to thelight-emitters E1 b, E2 a, E3 a, E4 a, E5 a, E6 a, and E7 a, so that thelight B6 may be switched among a plurality of kinds of first light, aplurality of kinds of second light, a plurality of kinds of third light,and a plurality of kinds of fourth light. In this embodiment, theproportions of the sub-lights V1 b, V2 a, V3 a, V4 a, V5 a, V6 a, and V7a are changed by pulse width modulation of the light emitters E1 b, E2a, E3 a, E4 a, E5 a, E6 a, and E7 a. For example, when the CS/P value ofthe light B6 is 0.4 as shown in FIG. 21B, the CCT of the light B6 may bemodulated from 2700K to 6500K by the control unit 620 executing pulsewidth modulation. When the CRI of the light B6 is 90, the CCT of thelight B6 may be modulated from 2700K to 6500K by the control unit 620executing pulse width modulation. In addition, when the CCT of the lightB6 is 6000 K, the CS/P value of the light B6 may be modulated from 0.4to 1.4 by the control unit 620 executing pulse width modulation. Whenthe CCT of the light B6 is 6000 K, the CRI of the light B6 may bemodulated from 1 to 92 by the control unit 620 executing pulse widthmodulation. In this embodiment, each of Duv values of the plurality ofkinds of first light, the plurality of kinds of second light, theplurality of kinds of third light, and the plurality of kinds of fourthlight is less than 0.005.

FIGS. 22A and 22B are graphs of the circadian action factor vs.correlated color temperature of light emitted from the light-emittingmodule in FIG. 20 respectively when the CRIs thereof are greater than 80and 90. Referring to FIGS. 20, 21B, 22A, and 22B, the control unit 620may also make the light B6 emitted from the light-emitting module 610 bswitched among a plurality of kinds of fourth light, circadian actionfactors (i.e. CS/P values) of the plurality of kinds of fourth lightcover or are substantially the same as circadian action factors ofsunlight within a correlated color temperature range, wherein thecorrelated color temperature range is, for example, a range of 3000 K to6500 K. The gray round dots and the gray line in FIGS. 21B, 22A, and 22Bshow the circadian action factors respectively corresponding to CCTs ofsunlight, and all the black square dots in FIGS. 21B, 22A, and 22B showthe circadian action factors respectively corresponding to CCTs of theplurality of kinds of fourth light. In FIGS. 21B and 22A, the circadianaction factors (i.e. CS/P values) of the plurality of kinds of fourthlight cover the circadian action factors of sunlight within thecorrelated color temperature range, e.g. a CCT range from 3000 K to 6500K. Besides, in FIG. 22B, the circadian action factors (i.e. CS/P values)of the plurality of kinds of fourth light are substantially the same asthe circadian action factors of sunlight within the correlated colortemperature range, e.g. a CCT range from 3000 K to 6500 K, wherein That“the circadian action factors (i.e. CS/P values) of the plurality ofkinds of fourth light are substantially the same as the circadian actionfactors of sunlight” means that the deviations of the circadian actionfactors of the plurality of kinds of fourth light from the circadianaction factors of sunlight at corresponding CCTs are respectively within±20% of the circadian action factors at the corresponding CCTs,preferably within ±10% of the circadian action factors at thecorresponding CCTs.

The aforementioned control unit includes, for example, a centralprocessing unit (CPU), a microprocessor, a digital signal processor(DSP), a programmable controller, a programmable logic device (PLD), orother similar devices, or a combination of the said devices, which arenot particularly limited by the disclosure. Further, in an embodiment,each of the functions performed by the control unit may be implementedas a plurality of program codes. These program codes will be stored in amemory, so that these program codes may be executed by the control unit.Alternatively, in an embodiment, each of the functions performed by thecontrol unit may be implemented as one or more circuits. The disclosureis not intended to limit whether each of the functions performed by thecontrol unit is implemented by ways of software or hardware.

In summary, the light source apparatus in the embodiments of thedisclosure can use the control unit to control the light-emitting modulefor providing lights with the same color temperature and different CS/Pvalues. The light-emitting module can also provide lights with aplurality of sets of color temperatures through a plurality of sets oflight-emitting units, and the light of each set of the same colortemperatures can be switched between different lights with differentCS/P values. In addition, the light source apparatus in the embodimentsof the disclosure can provide lights with over 5% difference of CS/Pvalues by controlling the light-emitting module through the controlunit, in which the lights can have totally different color temperatures,or a part of the lights has the same color temperature. In this way, thelight source apparatus can select light sources with different CS/Pvalues according to the real application environment, the time and thegoal so as to maintain the natural circadian rhythm of the user andmeanwhile provide enough light sources. The light source apparatus ofthe disclosure can serve as an illumination device or a backlight deviceof a display, which the disclosure is not limited to.

Moreover, in the light source apparatus according to the embodiments,since the color temperatures of the first light and the second light aresubstantially the same as each other and the spectra of the first lightand the second light are different, when a plurality of light sourceapparatuses or light-emitting modules are disposed in the sameexhibition space and respectively emit the first light and the secondlight, the light color of the light source apparatuses or light-emittingmodules is uniform, and the first light and the second light mayrespectively achieve different functions.

Additionally, in the light source apparatus according to theembodiments, since correlated color temperatures of the plurality ofkinds of first light are different from each other, and circadian actionfactors of the plurality of kinds of first light are substantially thesame as each other, so that the light source apparatus may have moreapplications.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of thedisclosed embodiments without departing from the scope or spirit of thedisclosure. In view of the foregoing, it is intended that the disclosurecover modifications and variations of this disclosure provided they fallwithin the scope of the following claims and their equivalents.

What is claimed is:
 1. A light source apparatus, comprising: a light-emitting module, configured to provide a light; and a control unit, making the light emitted from the light-emitting module switched among a plurality of kinds of first light, wherein correlated color temperatures of the plurality of kinds of first light are different from each other, and circadian action factors of the plurality of kinds of first light are substantially the same as each other.
 2. The light source apparatus according to claim 1, wherein each of Duv values of the plurality of kinds of first light is less than 0.005.
 3. The light source apparatus according to claim 1, wherein the control unit also makes the light emitted from the light-emitting module switched among a plurality of kinds of second light, wherein correlated color temperatures of the plurality of kinds of second light are different from each other, and color rendering indices of the plurality of kinds of second light are substantially the same as each other.
 4. The light source apparatus according to claim 3, wherein each of Duv values of the plurality of kinds of second light is less than 0.005.
 5. The light source apparatus according to claim 1, wherein the control unit also makes the light emitted from the light-emitting module switched among a plurality of kinds of third light, wherein correlated color temperatures of the plurality of kinds of third light are substantially the same as each other, and color rendering indices or circadian action factors of the plurality of kinds of third light are different from each other.
 6. The light source apparatus according to claim 5, wherein each of Duv values of the plurality of kinds of third light is less than 0.005.
 7. The light source apparatus according to claim 5, wherein the light-emitting module comprises a plurality of light emitters respectively emitting sub-lights with different wavelength ranges, the sub-lights form the light provided by the light-emitting module, the light emitted from the light-emitting module are switched among the plurality of kinds of first light and the plurality of kinds of third light by changing proportions of the sub-lights.
 8. The light source apparatus according to claim 1, wherein the control unit also makes the light emitted from the light-emitting module switched among a plurality of kinds of fourth light, circadian action factors of the plurality of kinds of fourth light cover or are substantially the same as circadian action factors of sunlight within a correlated color temperature range.
 9. The light source apparatus according to claim 8, wherein the correlated color temperature range comprises a range of 3000 K to 6500 K.
 10. The light source apparatus according to claim 9, each of the color rendering indices of the plurality of kinds of fourth light is greater than
 80. 11. The light source apparatus according to claim 8, wherein each of Duv values of the plurality of kinds of fourth light is less than 0.005.
 12. The light source apparatus according to claim 8, wherein the light-emitting module comprises a plurality of light emitters respectively emitting sub-lights with different wavelength ranges, the sub-lights form the light provided by the light-emitting module, the light emitted from the light-emitting module are switched among the plurality of kinds of first light and the plurality of kinds of fourth light by changing proportions of the sub-lights.
 13. The light source apparatus according to claim 1, wherein the light-emitting module comprises a plurality of light emitters respectively emitting sub-lights with different wavelength ranges, and the sub-lights form the light provided by the light-emitting module.
 14. The light source apparatus according to claim 13, wherein the light-emitters comprise an electroluminescent light-emitting element, a light-induced light-emitting element or a combination thereof.
 15. The light source apparatus according to claim 14, wherein the electroluminescent light-emitting element is a light-emitting diode chip, and the light-induced light-emitting element is phosphor.
 16. The light source apparatus according to claim 13, wherein the light emitted from the light-emitting module are switched among the plurality of kinds of first light by changing proportions of the sub-lights.
 17. The light source apparatus according to claim 16, wherein the proportions of the sub-lights are changed by pulse width modulation of the light emitters.
 18. The light source apparatus according to claim 13, wherein the light-emitters comprise a plurality of light-emitting diode chips, and a full width at half maximum of each of sub-lights emitted by the light-emitting diode chips is less than 40 nanometers.
 19. The light source apparatus according to claim 13, wherein the sub-lights are visible lights. 